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Btrfs: device_list_add() should not update list when mounted
[linux/fpc-iii.git] / drivers / mfd / sm501.c
blob81e6d0932bf0afa096e84387cb241c4f6e57785e
1 /* linux/drivers/mfd/sm501.c
2 *
3 * Copyright (C) 2006 Simtec Electronics
4 * Ben Dooks <ben@simtec.co.uk>
5 * Vincent Sanders <vince@simtec.co.uk>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * SM501 MFD driver
12 */
13
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/delay.h>
17 #include <linux/init.h>
18 #include <linux/list.h>
19 #include <linux/device.h>
20 #include <linux/platform_device.h>
21 #include <linux/pci.h>
22 #include <linux/i2c-gpio.h>
23 #include <linux/slab.h>
24
25 #include <linux/sm501.h>
26 #include <linux/sm501-regs.h>
27 #include <linux/serial_8250.h>
28
29 #include <linux/io.h>
30
31 struct sm501_device {
32 struct list_head list;
33 struct platform_device pdev;
34 };
35
36 struct sm501_gpio;
37
38 #ifdef CONFIG_MFD_SM501_GPIO
39 #include <linux/gpio.h>
40
41 struct sm501_gpio_chip {
42 struct gpio_chip gpio;
43 struct sm501_gpio *ourgpio; /* to get back to parent. */
44 void __iomem *regbase;
45 void __iomem *control; /* address of control reg. */
46 };
47
48 struct sm501_gpio {
49 struct sm501_gpio_chip low;
50 struct sm501_gpio_chip high;
51 spinlock_t lock;
52
53 unsigned int registered : 1;
54 void __iomem *regs;
55 struct resource *regs_res;
56 };
57 #else
58 struct sm501_gpio {
59 /* no gpio support, empty definition for sm501_devdata. */
60 };
61 #endif
62
63 struct sm501_devdata {
64 spinlock_t reg_lock;
65 struct mutex clock_lock;
66 struct list_head devices;
67 struct sm501_gpio gpio;
68
69 struct device *dev;
70 struct resource *io_res;
71 struct resource *mem_res;
72 struct resource *regs_claim;
73 struct sm501_platdata *platdata;
74
75
76 unsigned int in_suspend;
77 unsigned long pm_misc;
78
79 int unit_power[20];
80 unsigned int pdev_id;
81 unsigned int irq;
82 void __iomem *regs;
83 unsigned int rev;
84 };
85
86
87 #define MHZ (1000 * 1000)
88
89 #ifdef DEBUG
90 static const unsigned int div_tab[] = {
91 [0] = 1,
92 [1] = 2,
93 [2] = 4,
94 [3] = 8,
95 [4] = 16,
96 [5] = 32,
97 [6] = 64,
98 [7] = 128,
99 [8] = 3,
100 [9] = 6,
101 [10] = 12,
102 [11] = 24,
103 [12] = 48,
104 [13] = 96,
105 [14] = 192,
106 [15] = 384,
107 [16] = 5,
108 [17] = 10,
109 [18] = 20,
110 [19] = 40,
111 [20] = 80,
112 [21] = 160,
113 [22] = 320,
114 [23] = 604,
115 };
116
117 static unsigned long decode_div(unsigned long pll2, unsigned long val,
118 unsigned int lshft, unsigned int selbit,
119 unsigned long mask)
120 {
121 if (val & selbit)
122 pll2 = 288 * MHZ;
123
124 return pll2 / div_tab[(val >> lshft) & mask];
125 }
126
127 #define fmt_freq(x) ((x) / MHZ), ((x) % MHZ), (x)
128
129 /* sm501_dump_clk
130 *
131 * Print out the current clock configuration for the device
132 */
133
134 static void sm501_dump_clk(struct sm501_devdata *sm)
135 {
136 unsigned long misct = smc501_readl(sm->regs + SM501_MISC_TIMING);
137 unsigned long pm0 = smc501_readl(sm->regs + SM501_POWER_MODE_0_CLOCK);
138 unsigned long pm1 = smc501_readl(sm->regs + SM501_POWER_MODE_1_CLOCK);
139 unsigned long pmc = smc501_readl(sm->regs + SM501_POWER_MODE_CONTROL);
140 unsigned long sdclk0, sdclk1;
141 unsigned long pll2 = 0;
142
143 switch (misct & 0x30) {
144 case 0x00:
145 pll2 = 336 * MHZ;
146 break;
147 case 0x10:
148 pll2 = 288 * MHZ;
149 break;
150 case 0x20:
151 pll2 = 240 * MHZ;
152 break;
153 case 0x30:
154 pll2 = 192 * MHZ;
155 break;
156 }
157
158 sdclk0 = (misct & (1<<12)) ? pll2 : 288 * MHZ;
159 sdclk0 /= div_tab[((misct >> 8) & 0xf)];
160
161 sdclk1 = (misct & (1<<20)) ? pll2 : 288 * MHZ;
162 sdclk1 /= div_tab[((misct >> 16) & 0xf)];
163
164 dev_dbg(sm->dev, "MISCT=%08lx, PM0=%08lx, PM1=%08lx\n",
165 misct, pm0, pm1);
166
167 dev_dbg(sm->dev, "PLL2 = %ld.%ld MHz (%ld), SDCLK0=%08lx, SDCLK1=%08lx\n",
168 fmt_freq(pll2), sdclk0, sdclk1);
169
170 dev_dbg(sm->dev, "SDRAM: PM0=%ld, PM1=%ld\n", sdclk0, sdclk1);
171
172 dev_dbg(sm->dev, "PM0[%c]: "
173 "P2 %ld.%ld MHz (%ld), V2 %ld.%ld (%ld), "
174 "M %ld.%ld (%ld), MX1 %ld.%ld (%ld)\n",
175 (pmc & 3 ) == 0 ? '*' : '-',
176 fmt_freq(decode_div(pll2, pm0, 24, 1<<29, 31)),
177 fmt_freq(decode_div(pll2, pm0, 16, 1<<20, 15)),
178 fmt_freq(decode_div(pll2, pm0, 8, 1<<12, 15)),
179 fmt_freq(decode_div(pll2, pm0, 0, 1<<4, 15)));
180
181 dev_dbg(sm->dev, "PM1[%c]: "
182 "P2 %ld.%ld MHz (%ld), V2 %ld.%ld (%ld), "
183 "M %ld.%ld (%ld), MX1 %ld.%ld (%ld)\n",
184 (pmc & 3 ) == 1 ? '*' : '-',
185 fmt_freq(decode_div(pll2, pm1, 24, 1<<29, 31)),
186 fmt_freq(decode_div(pll2, pm1, 16, 1<<20, 15)),
187 fmt_freq(decode_div(pll2, pm1, 8, 1<<12, 15)),
188 fmt_freq(decode_div(pll2, pm1, 0, 1<<4, 15)));
189 }
190
191 static void sm501_dump_regs(struct sm501_devdata *sm)
192 {
193 void __iomem *regs = sm->regs;
194
195 dev_info(sm->dev, "System Control %08x\n",
196 smc501_readl(regs + SM501_SYSTEM_CONTROL));
197 dev_info(sm->dev, "Misc Control %08x\n",
198 smc501_readl(regs + SM501_MISC_CONTROL));
199 dev_info(sm->dev, "GPIO Control Low %08x\n",
200 smc501_readl(regs + SM501_GPIO31_0_CONTROL));
201 dev_info(sm->dev, "GPIO Control Hi %08x\n",
202 smc501_readl(regs + SM501_GPIO63_32_CONTROL));
203 dev_info(sm->dev, "DRAM Control %08x\n",
204 smc501_readl(regs + SM501_DRAM_CONTROL));
205 dev_info(sm->dev, "Arbitration Ctrl %08x\n",
206 smc501_readl(regs + SM501_ARBTRTN_CONTROL));
207 dev_info(sm->dev, "Misc Timing %08x\n",
208 smc501_readl(regs + SM501_MISC_TIMING));
209 }
210
211 static void sm501_dump_gate(struct sm501_devdata *sm)
212 {
213 dev_info(sm->dev, "CurrentGate %08x\n",
214 smc501_readl(sm->regs + SM501_CURRENT_GATE));
215 dev_info(sm->dev, "CurrentClock %08x\n",
216 smc501_readl(sm->regs + SM501_CURRENT_CLOCK));
217 dev_info(sm->dev, "PowerModeControl %08x\n",
218 smc501_readl(sm->regs + SM501_POWER_MODE_CONTROL));
219 }
220
221 #else
222 static inline void sm501_dump_gate(struct sm501_devdata *sm) { }
223 static inline void sm501_dump_regs(struct sm501_devdata *sm) { }
224 static inline void sm501_dump_clk(struct sm501_devdata *sm) { }
225 #endif
226
227 /* sm501_sync_regs
228 *
229 * ensure the
230 */
231
232 static void sm501_sync_regs(struct sm501_devdata *sm)
233 {
234 smc501_readl(sm->regs);
235 }
236
237 static inline void sm501_mdelay(struct sm501_devdata *sm, unsigned int delay)
238 {
239 /* during suspend/resume, we are currently not allowed to sleep,
240 * so change to using mdelay() instead of msleep() if we
241 * are in one of these paths */
242
243 if (sm->in_suspend)
244 mdelay(delay);
245 else
246 msleep(delay);
247 }
248
249 /* sm501_misc_control
250 *
251 * alters the miscellaneous control parameters
252 */
253
254 int sm501_misc_control(struct device *dev,
255 unsigned long set, unsigned long clear)
256 {
257 struct sm501_devdata *sm = dev_get_drvdata(dev);
258 unsigned long misc;
259 unsigned long save;
260 unsigned long to;
261
262 spin_lock_irqsave(&sm->reg_lock, save);
263
264 misc = smc501_readl(sm->regs + SM501_MISC_CONTROL);
265 to = (misc & ~clear) | set;
266
267 if (to != misc) {
268 smc501_writel(to, sm->regs + SM501_MISC_CONTROL);
269 sm501_sync_regs(sm);
270
271 dev_dbg(sm->dev, "MISC_CONTROL %08lx\n", misc);
272 }
273
274 spin_unlock_irqrestore(&sm->reg_lock, save);
275 return to;
276 }
277
278 EXPORT_SYMBOL_GPL(sm501_misc_control);
279
280 /* sm501_modify_reg
281 *
282 * Modify a register in the SM501 which may be shared with other
283 * drivers.
284 */
285
286 unsigned long sm501_modify_reg(struct device *dev,
287 unsigned long reg,
288 unsigned long set,
289 unsigned long clear)
290 {
291 struct sm501_devdata *sm = dev_get_drvdata(dev);
292 unsigned long data;
293 unsigned long save;
294
295 spin_lock_irqsave(&sm->reg_lock, save);
296
297 data = smc501_readl(sm->regs + reg);
298 data |= set;
299 data &= ~clear;
300
301 smc501_writel(data, sm->regs + reg);
302 sm501_sync_regs(sm);
303
304 spin_unlock_irqrestore(&sm->reg_lock, save);
305
306 return data;
307 }
308
309 EXPORT_SYMBOL_GPL(sm501_modify_reg);
310
311 /* sm501_unit_power
312 *
313 * alters the power active gate to set specific units on or off
314 */
315
316 int sm501_unit_power(struct device *dev, unsigned int unit, unsigned int to)
317 {
318 struct sm501_devdata *sm = dev_get_drvdata(dev);
319 unsigned long mode;
320 unsigned long gate;
321 unsigned long clock;
322
323 mutex_lock(&sm->clock_lock);
324
325 mode = smc501_readl(sm->regs + SM501_POWER_MODE_CONTROL);
326 gate = smc501_readl(sm->regs + SM501_CURRENT_GATE);
327 clock = smc501_readl(sm->regs + SM501_CURRENT_CLOCK);
328
329 mode &= 3; /* get current power mode */
330
331 if (unit >= ARRAY_SIZE(sm->unit_power)) {
332 dev_err(dev, "%s: bad unit %d\n", __func__, unit);
333 goto already;
334 }
335
336 dev_dbg(sm->dev, "%s: unit %d, cur %d, to %d\n", __func__, unit,
337 sm->unit_power[unit], to);
338
339 if (to == 0 && sm->unit_power[unit] == 0) {
340 dev_err(sm->dev, "unit %d is already shutdown\n", unit);
341 goto already;
342 }
343
344 sm->unit_power[unit] += to ? 1 : -1;
345 to = sm->unit_power[unit] ? 1 : 0;
346
347 if (to) {
348 if (gate & (1 << unit))
349 goto already;
350 gate |= (1 << unit);
351 } else {
352 if (!(gate & (1 << unit)))
353 goto already;
354 gate &= ~(1 << unit);
355 }
356
357 switch (mode) {
358 case 1:
359 smc501_writel(gate, sm->regs + SM501_POWER_MODE_0_GATE);
360 smc501_writel(clock, sm->regs + SM501_POWER_MODE_0_CLOCK);
361 mode = 0;
362 break;
363 case 2:
364 case 0:
365 smc501_writel(gate, sm->regs + SM501_POWER_MODE_1_GATE);
366 smc501_writel(clock, sm->regs + SM501_POWER_MODE_1_CLOCK);
367 mode = 1;
368 break;
369
370 default:
371 gate = -1;
372 goto already;
373 }
374
375 smc501_writel(mode, sm->regs + SM501_POWER_MODE_CONTROL);
376 sm501_sync_regs(sm);
377
378 dev_dbg(sm->dev, "gate %08lx, clock %08lx, mode %08lx\n",
379 gate, clock, mode);
380
381 sm501_mdelay(sm, 16);
382
383 already:
384 mutex_unlock(&sm->clock_lock);
385 return gate;
386 }
387
388 EXPORT_SYMBOL_GPL(sm501_unit_power);
389
390 /* clock value structure. */
391 struct sm501_clock {
392 unsigned long mclk;
393 int divider;
394 int shift;
395 unsigned int m, n, k;
396 };
397
398 /* sm501_calc_clock
399 *
400 * Calculates the nearest discrete clock frequency that
401 * can be achieved with the specified input clock.
402 * the maximum divisor is 3 or 5
403 */
404
405 static int sm501_calc_clock(unsigned long freq,
406 struct sm501_clock *clock,
407 int max_div,
408 unsigned long mclk,
409 long *best_diff)
410 {
411 int ret = 0;
412 int divider;
413 int shift;
414 long diff;
415
416 /* try dividers 1 and 3 for CRT and for panel,
417 try divider 5 for panel only.*/
418
419 for (divider = 1; divider <= max_div; divider += 2) {
420 /* try all 8 shift values.*/
421 for (shift = 0; shift < 8; shift++) {
422 /* Calculate difference to requested clock */
423 diff = DIV_ROUND_CLOSEST(mclk, divider << shift) - freq;
424 if (diff < 0)
425 diff = -diff;
426
427 /* If it is less than the current, use it */
428 if (diff < *best_diff) {
429 *best_diff = diff;
430
431 clock->mclk = mclk;
432 clock->divider = divider;
433 clock->shift = shift;
434 ret = 1;
435 }
436 }
437 }
438
439 return ret;
440 }
441
442 /* sm501_calc_pll
443 *
444 * Calculates the nearest discrete clock frequency that can be
445 * achieved using the programmable PLL.
446 * the maximum divisor is 3 or 5
447 */
448
449 static unsigned long sm501_calc_pll(unsigned long freq,
450 struct sm501_clock *clock,
451 int max_div)
452 {
453 unsigned long mclk;
454 unsigned int m, n, k;
455 long best_diff = 999999999;
456
457 /*
458 * The SM502 datasheet doesn't specify the min/max values for M and N.
459 * N = 1 at least doesn't work in practice.
460 */
461 for (m = 2; m <= 255; m++) {
462 for (n = 2; n <= 127; n++) {
463 for (k = 0; k <= 1; k++) {
464 mclk = (24000000UL * m / n) >> k;
465
466 if (sm501_calc_clock(freq, clock, max_div,
467 mclk, &best_diff)) {
468 clock->m = m;
469 clock->n = n;
470 clock->k = k;
471 }
472 }
473 }
474 }
475
476 /* Return best clock. */
477 return clock->mclk / (clock->divider << clock->shift);
478 }
479
480 /* sm501_select_clock
481 *
482 * Calculates the nearest discrete clock frequency that can be
483 * achieved using the 288MHz and 336MHz PLLs.
484 * the maximum divisor is 3 or 5
485 */
486
487 static unsigned long sm501_select_clock(unsigned long freq,
488 struct sm501_clock *clock,
489 int max_div)
490 {
491 unsigned long mclk;
492 long best_diff = 999999999;
493
494 /* Try 288MHz and 336MHz clocks. */
495 for (mclk = 288000000; mclk <= 336000000; mclk += 48000000) {
496 sm501_calc_clock(freq, clock, max_div, mclk, &best_diff);
497 }
498
499 /* Return best clock. */
500 return clock->mclk / (clock->divider << clock->shift);
501 }
502
503 /* sm501_set_clock
504 *
505 * set one of the four clock sources to the closest available frequency to
506 * the one specified
507 */
508
509 unsigned long sm501_set_clock(struct device *dev,
510 int clksrc,
511 unsigned long req_freq)
512 {
513 struct sm501_devdata *sm = dev_get_drvdata(dev);
514 unsigned long mode = smc501_readl(sm->regs + SM501_POWER_MODE_CONTROL);
515 unsigned long gate = smc501_readl(sm->regs + SM501_CURRENT_GATE);
516 unsigned long clock = smc501_readl(sm->regs + SM501_CURRENT_CLOCK);
517 unsigned char reg;
518 unsigned int pll_reg = 0;
519 unsigned long sm501_freq; /* the actual frequency achieved */
520
521 struct sm501_clock to;
522
523 /* find achivable discrete frequency and setup register value
524 * accordingly, V2XCLK, MCLK and M1XCLK are the same P2XCLK
525 * has an extra bit for the divider */
526
527 switch (clksrc) {
528 case SM501_CLOCK_P2XCLK:
529 /* This clock is divided in half so to achieve the
530 * requested frequency the value must be multiplied by
531 * 2. This clock also has an additional pre divisor */
532
533 if (sm->rev >= 0xC0) {
534 /* SM502 -> use the programmable PLL */
535 sm501_freq = (sm501_calc_pll(2 * req_freq,
536 &to, 5) / 2);
537 reg = to.shift & 0x07;/* bottom 3 bits are shift */
538 if (to.divider == 3)
539 reg |= 0x08; /* /3 divider required */
540 else if (to.divider == 5)
541 reg |= 0x10; /* /5 divider required */
542 reg |= 0x40; /* select the programmable PLL */
543 pll_reg = 0x20000 | (to.k << 15) | (to.n << 8) | to.m;
544 } else {
545 sm501_freq = (sm501_select_clock(2 * req_freq,
546 &to, 5) / 2);
547 reg = to.shift & 0x07;/* bottom 3 bits are shift */
548 if (to.divider == 3)
549 reg |= 0x08; /* /3 divider required */
550 else if (to.divider == 5)
551 reg |= 0x10; /* /5 divider required */
552 if (to.mclk != 288000000)
553 reg |= 0x20; /* which mclk pll is source */
554 }
555 break;
556
557 case SM501_CLOCK_V2XCLK:
558 /* This clock is divided in half so to achieve the
559 * requested frequency the value must be multiplied by 2. */
560
561 sm501_freq = (sm501_select_clock(2 * req_freq, &to, 3) / 2);
562 reg=to.shift & 0x07; /* bottom 3 bits are shift */
563 if (to.divider == 3)
564 reg |= 0x08; /* /3 divider required */
565 if (to.mclk != 288000000)
566 reg |= 0x10; /* which mclk pll is source */
567 break;
568
569 case SM501_CLOCK_MCLK:
570 case SM501_CLOCK_M1XCLK:
571 /* These clocks are the same and not further divided */
572
573 sm501_freq = sm501_select_clock( req_freq, &to, 3);
574 reg=to.shift & 0x07; /* bottom 3 bits are shift */
575 if (to.divider == 3)
576 reg |= 0x08; /* /3 divider required */
577 if (to.mclk != 288000000)
578 reg |= 0x10; /* which mclk pll is source */
579 break;
580
581 default:
582 return 0; /* this is bad */
583 }
584
585 mutex_lock(&sm->clock_lock);
586
587 mode = smc501_readl(sm->regs + SM501_POWER_MODE_CONTROL);
588 gate = smc501_readl(sm->regs + SM501_CURRENT_GATE);
589 clock = smc501_readl(sm->regs + SM501_CURRENT_CLOCK);
590
591 clock = clock & ~(0xFF << clksrc);
592 clock |= reg<<clksrc;
593
594 mode &= 3; /* find current mode */
595
596 switch (mode) {
597 case 1:
598 smc501_writel(gate, sm->regs + SM501_POWER_MODE_0_GATE);
599 smc501_writel(clock, sm->regs + SM501_POWER_MODE_0_CLOCK);
600 mode = 0;
601 break;
602 case 2:
603 case 0:
604 smc501_writel(gate, sm->regs + SM501_POWER_MODE_1_GATE);
605 smc501_writel(clock, sm->regs + SM501_POWER_MODE_1_CLOCK);
606 mode = 1;
607 break;
608
609 default:
610 mutex_unlock(&sm->clock_lock);
611 return -1;
612 }
613
614 smc501_writel(mode, sm->regs + SM501_POWER_MODE_CONTROL);
615
616 if (pll_reg)
617 smc501_writel(pll_reg,
618 sm->regs + SM501_PROGRAMMABLE_PLL_CONTROL);
619
620 sm501_sync_regs(sm);
621
622 dev_dbg(sm->dev, "gate %08lx, clock %08lx, mode %08lx\n",
623 gate, clock, mode);
624
625 sm501_mdelay(sm, 16);
626 mutex_unlock(&sm->clock_lock);
627
628 sm501_dump_clk(sm);
629
630 return sm501_freq;
631 }
632
633 EXPORT_SYMBOL_GPL(sm501_set_clock);
634
635 /* sm501_find_clock
636 *
637 * finds the closest available frequency for a given clock
638 */
639
640 unsigned long sm501_find_clock(struct device *dev,
641 int clksrc,
642 unsigned long req_freq)
643 {
644 struct sm501_devdata *sm = dev_get_drvdata(dev);
645 unsigned long sm501_freq; /* the frequency achieveable by the 501 */
646 struct sm501_clock to;
647
648 switch (clksrc) {
649 case SM501_CLOCK_P2XCLK:
650 if (sm->rev >= 0xC0) {
651 /* SM502 -> use the programmable PLL */
652 sm501_freq = (sm501_calc_pll(2 * req_freq,
653 &to, 5) / 2);
654 } else {
655 sm501_freq = (sm501_select_clock(2 * req_freq,
656 &to, 5) / 2);
657 }
658 break;
659
660 case SM501_CLOCK_V2XCLK:
661 sm501_freq = (sm501_select_clock(2 * req_freq, &to, 3) / 2);
662 break;
663
664 case SM501_CLOCK_MCLK:
665 case SM501_CLOCK_M1XCLK:
666 sm501_freq = sm501_select_clock(req_freq, &to, 3);
667 break;
668
669 default:
670 sm501_freq = 0; /* error */
671 }
672
673 return sm501_freq;
674 }
675
676 EXPORT_SYMBOL_GPL(sm501_find_clock);
677
678 static struct sm501_device *to_sm_device(struct platform_device *pdev)
679 {
680 return container_of(pdev, struct sm501_device, pdev);
681 }
682
683 /* sm501_device_release
684 *
685 * A release function for the platform devices we create to allow us to
686 * free any items we allocated
687 */
688
689 static void sm501_device_release(struct device *dev)
690 {
691 kfree(to_sm_device(to_platform_device(dev)));
692 }
693
694 /* sm501_create_subdev
695 *
696 * Create a skeleton platform device with resources for passing to a
697 * sub-driver
698 */
699
700 static struct platform_device *
701 sm501_create_subdev(struct sm501_devdata *sm, char *name,
702 unsigned int res_count, unsigned int platform_data_size)
703 {
704 struct sm501_device *smdev;
705
706 smdev = kzalloc(sizeof(struct sm501_device) +
707 (sizeof(struct resource) * res_count) +
708 platform_data_size, GFP_KERNEL);
709 if (!smdev)
710 return NULL;
711
712 smdev->pdev.dev.release = sm501_device_release;
713
714 smdev->pdev.name = name;
715 smdev->pdev.id = sm->pdev_id;
716 smdev->pdev.dev.parent = sm->dev;
717
718 if (res_count) {
719 smdev->pdev.resource = (struct resource *)(smdev+1);
720 smdev->pdev.num_resources = res_count;
721 }
722 if (platform_data_size)
723 smdev->pdev.dev.platform_data = (void *)(smdev+1);
724
725 return &smdev->pdev;
726 }
727
728 /* sm501_register_device
729 *
730 * Register a platform device created with sm501_create_subdev()
731 */
732
733 static int sm501_register_device(struct sm501_devdata *sm,
734 struct platform_device *pdev)
735 {
736 struct sm501_device *smdev = to_sm_device(pdev);
737 int ptr;
738 int ret;
739
740 for (ptr = 0; ptr < pdev->num_resources; ptr++) {
741 printk(KERN_DEBUG "%s[%d] %pR\n",
742 pdev->name, ptr, &pdev->resource[ptr]);
743 }
744
745 ret = platform_device_register(pdev);
746
747 if (ret >= 0) {
748 dev_dbg(sm->dev, "registered %s\n", pdev->name);
749 list_add_tail(&smdev->list, &sm->devices);
750 } else
751 dev_err(sm->dev, "error registering %s (%d)\n",
752 pdev->name, ret);
753
754 return ret;
755 }
756
757 /* sm501_create_subio
758 *
759 * Fill in an IO resource for a sub device
760 */
761
762 static void sm501_create_subio(struct sm501_devdata *sm,
763 struct resource *res,
764 resource_size_t offs,
765 resource_size_t size)
766 {
767 res->flags = IORESOURCE_MEM;
768 res->parent = sm->io_res;
769 res->start = sm->io_res->start + offs;
770 res->end = res->start + size - 1;
771 }
772
773 /* sm501_create_mem
774 *
775 * Fill in an MEM resource for a sub device
776 */
777
778 static void sm501_create_mem(struct sm501_devdata *sm,
779 struct resource *res,
780 resource_size_t *offs,
781 resource_size_t size)
782 {
783 *offs -= size; /* adjust memory size */
784
785 res->flags = IORESOURCE_MEM;
786 res->parent = sm->mem_res;
787 res->start = sm->mem_res->start + *offs;
788 res->end = res->start + size - 1;
789 }
790
791 /* sm501_create_irq
792 *
793 * Fill in an IRQ resource for a sub device
794 */
795
796 static void sm501_create_irq(struct sm501_devdata *sm,
797 struct resource *res)
798 {
799 res->flags = IORESOURCE_IRQ;
800 res->parent = NULL;
801 res->start = res->end = sm->irq;
802 }
803
804 static int sm501_register_usbhost(struct sm501_devdata *sm,
805 resource_size_t *mem_avail)
806 {
807 struct platform_device *pdev;
808
809 pdev = sm501_create_subdev(sm, "sm501-usb", 3, 0);
810 if (!pdev)
811 return -ENOMEM;
812
813 sm501_create_subio(sm, &pdev->resource[0], 0x40000, 0x20000);
814 sm501_create_mem(sm, &pdev->resource[1], mem_avail, 256*1024);
815 sm501_create_irq(sm, &pdev->resource[2]);
816
817 return sm501_register_device(sm, pdev);
818 }
819
820 static void sm501_setup_uart_data(struct sm501_devdata *sm,
821 struct plat_serial8250_port *uart_data,
822 unsigned int offset)
823 {
824 uart_data->membase = sm->regs + offset;
825 uart_data->mapbase = sm->io_res->start + offset;
826 uart_data->iotype = UPIO_MEM;
827 uart_data->irq = sm->irq;
828 uart_data->flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_SHARE_IRQ;
829 uart_data->regshift = 2;
830 uart_data->uartclk = (9600 * 16);
831 }
832
833 static int sm501_register_uart(struct sm501_devdata *sm, int devices)
834 {
835 struct platform_device *pdev;
836 struct plat_serial8250_port *uart_data;
837
838 pdev = sm501_create_subdev(sm, "serial8250", 0,
839 sizeof(struct plat_serial8250_port) * 3);
840 if (!pdev)
841 return -ENOMEM;
842
843 uart_data = dev_get_platdata(&pdev->dev);
844
845 if (devices & SM501_USE_UART0) {
846 sm501_setup_uart_data(sm, uart_data++, 0x30000);
847 sm501_unit_power(sm->dev, SM501_GATE_UART0, 1);
848 sm501_modify_reg(sm->dev, SM501_IRQ_MASK, 1 << 12, 0);
849 sm501_modify_reg(sm->dev, SM501_GPIO63_32_CONTROL, 0x01e0, 0);
850 }
851 if (devices & SM501_USE_UART1) {
852 sm501_setup_uart_data(sm, uart_data++, 0x30020);
853 sm501_unit_power(sm->dev, SM501_GATE_UART1, 1);
854 sm501_modify_reg(sm->dev, SM501_IRQ_MASK, 1 << 13, 0);
855 sm501_modify_reg(sm->dev, SM501_GPIO63_32_CONTROL, 0x1e00, 0);
856 }
857
858 pdev->id = PLAT8250_DEV_SM501;
859
860 return sm501_register_device(sm, pdev);
861 }
862
863 static int sm501_register_display(struct sm501_devdata *sm,
864 resource_size_t *mem_avail)
865 {
866 struct platform_device *pdev;
867
868 pdev = sm501_create_subdev(sm, "sm501-fb", 4, 0);
869 if (!pdev)
870 return -ENOMEM;
871
872 sm501_create_subio(sm, &pdev->resource[0], 0x80000, 0x10000);
873 sm501_create_subio(sm, &pdev->resource[1], 0x100000, 0x50000);
874 sm501_create_mem(sm, &pdev->resource[2], mem_avail, *mem_avail);
875 sm501_create_irq(sm, &pdev->resource[3]);
876
877 return sm501_register_device(sm, pdev);
878 }
879
880 #ifdef CONFIG_MFD_SM501_GPIO
881
882 static inline struct sm501_gpio_chip *to_sm501_gpio(struct gpio_chip *gc)
883 {
884 return container_of(gc, struct sm501_gpio_chip, gpio);
885 }
886
887 static inline struct sm501_devdata *sm501_gpio_to_dev(struct sm501_gpio *gpio)
888 {
889 return container_of(gpio, struct sm501_devdata, gpio);
890 }
891
892 static int sm501_gpio_get(struct gpio_chip *chip, unsigned offset)
893
894 {
895 struct sm501_gpio_chip *smgpio = to_sm501_gpio(chip);
896 unsigned long result;
897
898 result = smc501_readl(smgpio->regbase + SM501_GPIO_DATA_LOW);
899 result >>= offset;
900
901 return result & 1UL;
902 }
903
904 static void sm501_gpio_ensure_gpio(struct sm501_gpio_chip *smchip,
905 unsigned long bit)
906 {
907 unsigned long ctrl;
908
909 /* check and modify if this pin is not set as gpio. */
910
911 if (smc501_readl(smchip->control) & bit) {
912 dev_info(sm501_gpio_to_dev(smchip->ourgpio)->dev,
913 "changing mode of gpio, bit %08lx\n", bit);
914
915 ctrl = smc501_readl(smchip->control);
916 ctrl &= ~bit;
917 smc501_writel(ctrl, smchip->control);
918
919 sm501_sync_regs(sm501_gpio_to_dev(smchip->ourgpio));
920 }
921 }
922
923 static void sm501_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
924
925 {
926 struct sm501_gpio_chip *smchip = to_sm501_gpio(chip);
927 struct sm501_gpio *smgpio = smchip->ourgpio;
928 unsigned long bit = 1 << offset;
929 void __iomem *regs = smchip->regbase;
930 unsigned long save;
931 unsigned long val;
932
933 dev_dbg(sm501_gpio_to_dev(smgpio)->dev, "%s(%p,%d)\n",
934 __func__, chip, offset);
935
936 spin_lock_irqsave(&smgpio->lock, save);
937
938 val = smc501_readl(regs + SM501_GPIO_DATA_LOW) & ~bit;
939 if (value)
940 val |= bit;
941 smc501_writel(val, regs);
942
943 sm501_sync_regs(sm501_gpio_to_dev(smgpio));
944 sm501_gpio_ensure_gpio(smchip, bit);
945
946 spin_unlock_irqrestore(&smgpio->lock, save);
947 }
948
949 static int sm501_gpio_input(struct gpio_chip *chip, unsigned offset)
950 {
951 struct sm501_gpio_chip *smchip = to_sm501_gpio(chip);
952 struct sm501_gpio *smgpio = smchip->ourgpio;
953 void __iomem *regs = smchip->regbase;
954 unsigned long bit = 1 << offset;
955 unsigned long save;
956 unsigned long ddr;
957
958 dev_dbg(sm501_gpio_to_dev(smgpio)->dev, "%s(%p,%d)\n",
959 __func__, chip, offset);
960
961 spin_lock_irqsave(&smgpio->lock, save);
962
963 ddr = smc501_readl(regs + SM501_GPIO_DDR_LOW);
964 smc501_writel(ddr & ~bit, regs + SM501_GPIO_DDR_LOW);
965
966 sm501_sync_regs(sm501_gpio_to_dev(smgpio));
967 sm501_gpio_ensure_gpio(smchip, bit);
968
969 spin_unlock_irqrestore(&smgpio->lock, save);
970
971 return 0;
972 }
973
974 static int sm501_gpio_output(struct gpio_chip *chip,
975 unsigned offset, int value)
976 {
977 struct sm501_gpio_chip *smchip = to_sm501_gpio(chip);
978 struct sm501_gpio *smgpio = smchip->ourgpio;
979 unsigned long bit = 1 << offset;
980 void __iomem *regs = smchip->regbase;
981 unsigned long save;
982 unsigned long val;
983 unsigned long ddr;
984
985 dev_dbg(sm501_gpio_to_dev(smgpio)->dev, "%s(%p,%d,%d)\n",
986 __func__, chip, offset, value);
987
988 spin_lock_irqsave(&smgpio->lock, save);
989
990 val = smc501_readl(regs + SM501_GPIO_DATA_LOW);
991 if (value)
992 val |= bit;
993 else
994 val &= ~bit;
995 smc501_writel(val, regs);
996
997 ddr = smc501_readl(regs + SM501_GPIO_DDR_LOW);
998 smc501_writel(ddr | bit, regs + SM501_GPIO_DDR_LOW);
999
1000 sm501_sync_regs(sm501_gpio_to_dev(smgpio));
1001 smc501_writel(val, regs + SM501_GPIO_DATA_LOW);
1002
1003 sm501_sync_regs(sm501_gpio_to_dev(smgpio));
1004 spin_unlock_irqrestore(&smgpio->lock, save);
1005
1006 return 0;
1007 }
1008
1009 static struct gpio_chip gpio_chip_template = {
1010 .ngpio = 32,
1011 .direction_input = sm501_gpio_input,
1012 .direction_output = sm501_gpio_output,
1013 .set = sm501_gpio_set,
1014 .get = sm501_gpio_get,
1015 };
1016
1017 static int sm501_gpio_register_chip(struct sm501_devdata *sm,
1018 struct sm501_gpio *gpio,
1019 struct sm501_gpio_chip *chip)
1020 {
1021 struct sm501_platdata *pdata = sm->platdata;
1022 struct gpio_chip *gchip = &chip->gpio;
1023 int base = pdata->gpio_base;
1024
1025 chip->gpio = gpio_chip_template;
1026
1027 if (chip == &gpio->high) {
1028 if (base > 0)
1029 base += 32;
1030 chip->regbase = gpio->regs + SM501_GPIO_DATA_HIGH;
1031 chip->control = sm->regs + SM501_GPIO63_32_CONTROL;
1032 gchip->label = "SM501-HIGH";
1033 } else {
1034 chip->regbase = gpio->regs + SM501_GPIO_DATA_LOW;
1035 chip->control = sm->regs + SM501_GPIO31_0_CONTROL;
1036 gchip->label = "SM501-LOW";
1037 }
1038
1039 gchip->base = base;
1040 chip->ourgpio = gpio;
1041
1042 return gpiochip_add(gchip);
1043 }
1044
1045 static int sm501_register_gpio(struct sm501_devdata *sm)
1046 {
1047 struct sm501_gpio *gpio = &sm->gpio;
1048 resource_size_t iobase = sm->io_res->start + SM501_GPIO;
1049 int ret;
1050 int tmp;
1051
1052 dev_dbg(sm->dev, "registering gpio block %08llx\n",
1053 (unsigned long long)iobase);
1054
1055 spin_lock_init(&gpio->lock);
1056
1057 gpio->regs_res = request_mem_region(iobase, 0x20, "sm501-gpio");
1058 if (gpio->regs_res == NULL) {
1059 dev_err(sm->dev, "gpio: failed to request region\n");
1060 return -ENXIO;
1061 }
1062
1063 gpio->regs = ioremap(iobase, 0x20);
1064 if (gpio->regs == NULL) {
1065 dev_err(sm->dev, "gpio: failed to remap registers\n");
1066 ret = -ENXIO;
1067 goto err_claimed;
1068 }
1069
1070 /* Register both our chips. */
1071
1072 ret = sm501_gpio_register_chip(sm, gpio, &gpio->low);
1073 if (ret) {
1074 dev_err(sm->dev, "failed to add low chip\n");
1075 goto err_mapped;
1076 }
1077
1078 ret = sm501_gpio_register_chip(sm, gpio, &gpio->high);
1079 if (ret) {
1080 dev_err(sm->dev, "failed to add high chip\n");
1081 goto err_low_chip;
1082 }
1083
1084 gpio->registered = 1;
1085
1086 return 0;
1087
1088 err_low_chip:
1089 tmp = gpiochip_remove(&gpio->low.gpio);
1090 if (tmp) {
1091 dev_err(sm->dev, "cannot remove low chip, cannot tidy up\n");
1092 return ret;
1093 }
1094
1095 err_mapped:
1096 iounmap(gpio->regs);
1097
1098 err_claimed:
1099 release_resource(gpio->regs_res);
1100 kfree(gpio->regs_res);
1101
1102 return ret;
1103 }
1104
1105 static void sm501_gpio_remove(struct sm501_devdata *sm)
1106 {
1107 struct sm501_gpio *gpio = &sm->gpio;
1108 int ret;
1109
1110 if (!sm->gpio.registered)
1111 return;
1112
1113 ret = gpiochip_remove(&gpio->low.gpio);
1114 if (ret)
1115 dev_err(sm->dev, "cannot remove low chip, cannot tidy up\n");
1116
1117 ret = gpiochip_remove(&gpio->high.gpio);
1118 if (ret)
1119 dev_err(sm->dev, "cannot remove high chip, cannot tidy up\n");
1120
1121 iounmap(gpio->regs);
1122 release_resource(gpio->regs_res);
1123 kfree(gpio->regs_res);
1124 }
1125
1126 static inline int sm501_gpio_pin2nr(struct sm501_devdata *sm, unsigned int pin)
1127 {
1128 struct sm501_gpio *gpio = &sm->gpio;
1129 int base = (pin < 32) ? gpio->low.gpio.base : gpio->high.gpio.base;
1130
1131 return (pin % 32) + base;
1132 }
1133
1134 static inline int sm501_gpio_isregistered(struct sm501_devdata *sm)
1135 {
1136 return sm->gpio.registered;
1137 }
1138 #else
1139 static inline int sm501_register_gpio(struct sm501_devdata *sm)
1140 {
1141 return 0;
1142 }
1143
1144 static inline void sm501_gpio_remove(struct sm501_devdata *sm)
1145 {
1146 }
1147
1148 static inline int sm501_gpio_pin2nr(struct sm501_devdata *sm, unsigned int pin)
1149 {
1150 return -1;
1151 }
1152
1153 static inline int sm501_gpio_isregistered(struct sm501_devdata *sm)
1154 {
1155 return 0;
1156 }
1157 #endif
1158
1159 static int sm501_register_gpio_i2c_instance(struct sm501_devdata *sm,
1160 struct sm501_platdata_gpio_i2c *iic)
1161 {
1162 struct i2c_gpio_platform_data *icd;
1163 struct platform_device *pdev;
1164
1165 pdev = sm501_create_subdev(sm, "i2c-gpio", 0,
1166 sizeof(struct i2c_gpio_platform_data));
1167 if (!pdev)
1168 return -ENOMEM;
1169
1170 icd = dev_get_platdata(&pdev->dev);
1171
1172 /* We keep the pin_sda and pin_scl fields relative in case the
1173 * same platform data is passed to >1 SM501.
1174 */
1175
1176 icd->sda_pin = sm501_gpio_pin2nr(sm, iic->pin_sda);
1177 icd->scl_pin = sm501_gpio_pin2nr(sm, iic->pin_scl);
1178 icd->timeout = iic->timeout;
1179 icd->udelay = iic->udelay;
1180
1181 /* note, we can't use either of the pin numbers, as the i2c-gpio
1182 * driver uses the platform.id field to generate the bus number
1183 * to register with the i2c core; The i2c core doesn't have enough
1184 * entries to deal with anything we currently use.
1185 */
1186
1187 pdev->id = iic->bus_num;
1188
1189 dev_info(sm->dev, "registering i2c-%d: sda=%d (%d), scl=%d (%d)\n",
1190 iic->bus_num,
1191 icd->sda_pin, iic->pin_sda, icd->scl_pin, iic->pin_scl);
1192
1193 return sm501_register_device(sm, pdev);
1194 }
1195
1196 static int sm501_register_gpio_i2c(struct sm501_devdata *sm,
1197 struct sm501_platdata *pdata)
1198 {
1199 struct sm501_platdata_gpio_i2c *iic = pdata->gpio_i2c;
1200 int index;
1201 int ret;
1202
1203 for (index = 0; index < pdata->gpio_i2c_nr; index++, iic++) {
1204 ret = sm501_register_gpio_i2c_instance(sm, iic);
1205 if (ret < 0)
1206 return ret;
1207 }
1208
1209 return 0;
1210 }
1211
1212 /* sm501_dbg_regs
1213 *
1214 * Debug attribute to attach to parent device to show core registers
1215 */
1216
1217 static ssize_t sm501_dbg_regs(struct device *dev,
1218 struct device_attribute *attr, char *buff)
1219 {
1220 struct sm501_devdata *sm = dev_get_drvdata(dev) ;
1221 unsigned int reg;
1222 char *ptr = buff;
1223 int ret;
1224
1225 for (reg = 0x00; reg < 0x70; reg += 4) {
1226 ret = sprintf(ptr, "%08x = %08x\n",
1227 reg, smc501_readl(sm->regs + reg));
1228 ptr += ret;
1229 }
1230
1231 return ptr - buff;
1232 }
1233
1234
1235 static DEVICE_ATTR(dbg_regs, 0444, sm501_dbg_regs, NULL);
1236
1237 /* sm501_init_reg
1238 *
1239 * Helper function for the init code to setup a register
1240 *
1241 * clear the bits which are set in r->mask, and then set
1242 * the bits set in r->set.
1243 */
1244
1245 static inline void sm501_init_reg(struct sm501_devdata *sm,
1246 unsigned long reg,
1247 struct sm501_reg_init *r)
1248 {
1249 unsigned long tmp;
1250
1251 tmp = smc501_readl(sm->regs + reg);
1252 tmp &= ~r->mask;
1253 tmp |= r->set;
1254 smc501_writel(tmp, sm->regs + reg);
1255 }
1256
1257 /* sm501_init_regs
1258 *
1259 * Setup core register values
1260 */
1261
1262 static void sm501_init_regs(struct sm501_devdata *sm,
1263 struct sm501_initdata *init)
1264 {
1265 sm501_misc_control(sm->dev,
1266 init->misc_control.set,
1267 init->misc_control.mask);
1268
1269 sm501_init_reg(sm, SM501_MISC_TIMING, &init->misc_timing);
1270 sm501_init_reg(sm, SM501_GPIO31_0_CONTROL, &init->gpio_low);
1271 sm501_init_reg(sm, SM501_GPIO63_32_CONTROL, &init->gpio_high);
1272
1273 if (init->m1xclk) {
1274 dev_info(sm->dev, "setting M1XCLK to %ld\n", init->m1xclk);
1275 sm501_set_clock(sm->dev, SM501_CLOCK_M1XCLK, init->m1xclk);
1276 }
1277
1278 if (init->mclk) {
1279 dev_info(sm->dev, "setting MCLK to %ld\n", init->mclk);
1280 sm501_set_clock(sm->dev, SM501_CLOCK_MCLK, init->mclk);
1281 }
1282
1283 }
1284
1285 /* Check the PLL sources for the M1CLK and M1XCLK
1286 *
1287 * If the M1CLK and M1XCLKs are not sourced from the same PLL, then
1288 * there is a risk (see errata AB-5) that the SM501 will cease proper
1289 * function. If this happens, then it is likely the SM501 will
1290 * hang the system.
1291 */
1292
1293 static int sm501_check_clocks(struct sm501_devdata *sm)
1294 {
1295 unsigned long pwrmode = smc501_readl(sm->regs + SM501_CURRENT_CLOCK);
1296 unsigned long msrc = (pwrmode & SM501_POWERMODE_M_SRC);
1297 unsigned long m1src = (pwrmode & SM501_POWERMODE_M1_SRC);
1298
1299 return ((msrc == 0 && m1src != 0) || (msrc != 0 && m1src == 0));
1300 }
1301
1302 static unsigned int sm501_mem_local[] = {
1303 [0] = 4*1024*1024,
1304 [1] = 8*1024*1024,
1305 [2] = 16*1024*1024,
1306 [3] = 32*1024*1024,
1307 [4] = 64*1024*1024,
1308 [5] = 2*1024*1024,
1309 };
1310
1311 /* sm501_init_dev
1312 *
1313 * Common init code for an SM501
1314 */
1315
1316 static int sm501_init_dev(struct sm501_devdata *sm)
1317 {
1318 struct sm501_initdata *idata;
1319 struct sm501_platdata *pdata;
1320 resource_size_t mem_avail;
1321 unsigned long dramctrl;
1322 unsigned long devid;
1323 int ret;
1324
1325 mutex_init(&sm->clock_lock);
1326 spin_lock_init(&sm->reg_lock);
1327
1328 INIT_LIST_HEAD(&sm->devices);
1329
1330 devid = smc501_readl(sm->regs + SM501_DEVICEID);
1331
1332 if ((devid & SM501_DEVICEID_IDMASK) != SM501_DEVICEID_SM501) {
1333 dev_err(sm->dev, "incorrect device id %08lx\n", devid);
1334 return -EINVAL;
1335 }
1336
1337 /* disable irqs */
1338 smc501_writel(0, sm->regs + SM501_IRQ_MASK);
1339
1340 dramctrl = smc501_readl(sm->regs + SM501_DRAM_CONTROL);
1341 mem_avail = sm501_mem_local[(dramctrl >> 13) & 0x7];
1342
1343 dev_info(sm->dev, "SM501 At %p: Version %08lx, %ld Mb, IRQ %d\n",
1344 sm->regs, devid, (unsigned long)mem_avail >> 20, sm->irq);
1345
1346 sm->rev = devid & SM501_DEVICEID_REVMASK;
1347
1348 sm501_dump_gate(sm);
1349
1350 ret = device_create_file(sm->dev, &dev_attr_dbg_regs);
1351 if (ret)
1352 dev_err(sm->dev, "failed to create debug regs file\n");
1353
1354 sm501_dump_clk(sm);
1355
1356 /* check to see if we have some device initialisation */
1357
1358 pdata = sm->platdata;
1359 idata = pdata ? pdata->init : NULL;
1360
1361 if (idata) {
1362 sm501_init_regs(sm, idata);
1363
1364 if (idata->devices & SM501_USE_USB_HOST)
1365 sm501_register_usbhost(sm, &mem_avail);
1366 if (idata->devices & (SM501_USE_UART0 | SM501_USE_UART1))
1367 sm501_register_uart(sm, idata->devices);
1368 if (idata->devices & SM501_USE_GPIO)
1369 sm501_register_gpio(sm);
1370 }
1371
1372 if (pdata && pdata->gpio_i2c != NULL && pdata->gpio_i2c_nr > 0) {
1373 if (!sm501_gpio_isregistered(sm))
1374 dev_err(sm->dev, "no gpio available for i2c gpio.\n");
1375 else
1376 sm501_register_gpio_i2c(sm, pdata);
1377 }
1378
1379 ret = sm501_check_clocks(sm);
1380 if (ret) {
1381 dev_err(sm->dev, "M1X and M clocks sourced from different "
1382 "PLLs\n");
1383 return -EINVAL;
1384 }
1385
1386 /* always create a framebuffer */
1387 sm501_register_display(sm, &mem_avail);
1388
1389 return 0;
1390 }
1391
1392 static int sm501_plat_probe(struct platform_device *dev)
1393 {
1394 struct sm501_devdata *sm;
1395 int ret;
1396
1397 sm = kzalloc(sizeof(struct sm501_devdata), GFP_KERNEL);
1398 if (sm == NULL) {
1399 dev_err(&dev->dev, "no memory for device data\n");
1400 ret = -ENOMEM;
1401 goto err1;
1402 }
1403
1404 sm->dev = &dev->dev;
1405 sm->pdev_id = dev->id;
1406 sm->platdata = dev_get_platdata(&dev->dev);
1407
1408 ret = platform_get_irq(dev, 0);
1409 if (ret < 0) {
1410 dev_err(&dev->dev, "failed to get irq resource\n");
1411 goto err_res;
1412 }
1413 sm->irq = ret;
1414
1415 sm->io_res = platform_get_resource(dev, IORESOURCE_MEM, 1);
1416 sm->mem_res = platform_get_resource(dev, IORESOURCE_MEM, 0);
1417
1418 if (sm->io_res == NULL || sm->mem_res == NULL) {
1419 dev_err(&dev->dev, "failed to get IO resource\n");
1420 ret = -ENOENT;
1421 goto err_res;
1422 }
1423
1424 sm->regs_claim = request_mem_region(sm->io_res->start,
1425 0x100, "sm501");
1426
1427 if (sm->regs_claim == NULL) {
1428 dev_err(&dev->dev, "cannot claim registers\n");
1429 ret = -EBUSY;
1430 goto err_res;
1431 }
1432
1433 platform_set_drvdata(dev, sm);
1434
1435 sm->regs = ioremap(sm->io_res->start, resource_size(sm->io_res));
1436
1437 if (sm->regs == NULL) {
1438 dev_err(&dev->dev, "cannot remap registers\n");
1439 ret = -EIO;
1440 goto err_claim;
1441 }
1442
1443 return sm501_init_dev(sm);
1444
1445 err_claim:
1446 release_resource(sm->regs_claim);
1447 kfree(sm->regs_claim);
1448 err_res:
1449 kfree(sm);
1450 err1:
1451 return ret;
1452
1453 }
1454
1455 #ifdef CONFIG_PM
1456
1457 /* power management support */
1458
1459 static void sm501_set_power(struct sm501_devdata *sm, int on)
1460 {
1461 struct sm501_platdata *pd = sm->platdata;
1462
1463 if (pd == NULL)
1464 return;
1465
1466 if (pd->get_power) {
1467 if (pd->get_power(sm->dev) == on) {
1468 dev_dbg(sm->dev, "is already %d\n", on);
1469 return;
1470 }
1471 }
1472
1473 if (pd->set_power) {
1474 dev_dbg(sm->dev, "setting power to %d\n", on);
1475
1476 pd->set_power(sm->dev, on);
1477 sm501_mdelay(sm, 10);
1478 }
1479 }
1480
1481 static int sm501_plat_suspend(struct platform_device *pdev, pm_message_t state)
1482 {
1483 struct sm501_devdata *sm = platform_get_drvdata(pdev);
1484
1485 sm->in_suspend = 1;
1486 sm->pm_misc = smc501_readl(sm->regs + SM501_MISC_CONTROL);
1487
1488 sm501_dump_regs(sm);
1489
1490 if (sm->platdata) {
1491 if (sm->platdata->flags & SM501_FLAG_SUSPEND_OFF)
1492 sm501_set_power(sm, 0);
1493 }
1494
1495 return 0;
1496 }
1497
1498 static int sm501_plat_resume(struct platform_device *pdev)
1499 {
1500 struct sm501_devdata *sm = platform_get_drvdata(pdev);
1501
1502 sm501_set_power(sm, 1);
1503
1504 sm501_dump_regs(sm);
1505 sm501_dump_gate(sm);
1506 sm501_dump_clk(sm);
1507
1508 /* check to see if we are in the same state as when suspended */
1509
1510 if (smc501_readl(sm->regs + SM501_MISC_CONTROL) != sm->pm_misc) {
1511 dev_info(sm->dev, "SM501_MISC_CONTROL changed over sleep\n");
1512 smc501_writel(sm->pm_misc, sm->regs + SM501_MISC_CONTROL);
1513
1514 /* our suspend causes the controller state to change,
1515 * either by something attempting setup, power loss,
1516 * or an external reset event on power change */
1517
1518 if (sm->platdata && sm->platdata->init) {
1519 sm501_init_regs(sm, sm->platdata->init);
1520 }
1521 }
1522
1523 /* dump our state from resume */
1524
1525 sm501_dump_regs(sm);
1526 sm501_dump_clk(sm);
1527
1528 sm->in_suspend = 0;
1529
1530 return 0;
1531 }
1532 #else
1533 #define sm501_plat_suspend NULL
1534 #define sm501_plat_resume NULL
1535 #endif
1536
1537 /* Initialisation data for PCI devices */
1538
1539 static struct sm501_initdata sm501_pci_initdata = {
1540 .gpio_high = {
1541 .set = 0x3F000000, /* 24bit panel */
1542 .mask = 0x0,
1543 },
1544 .misc_timing = {
1545 .set = 0x010100, /* SDRAM timing */
1546 .mask = 0x1F1F00,
1547 },
1548 .misc_control = {
1549 .set = SM501_MISC_PNL_24BIT,
1550 .mask = 0,
1551 },
1552
1553 .devices = SM501_USE_ALL,
1554
1555 /* Errata AB-3 says that 72MHz is the fastest available
1556 * for 33MHZ PCI with proper bus-mastering operation */
1557
1558 .mclk = 72 * MHZ,
1559 .m1xclk = 144 * MHZ,
1560 };
1561
1562 static struct sm501_platdata_fbsub sm501_pdata_fbsub = {
1563 .flags = (SM501FB_FLAG_USE_INIT_MODE |
1564 SM501FB_FLAG_USE_HWCURSOR |
1565 SM501FB_FLAG_USE_HWACCEL |
1566 SM501FB_FLAG_DISABLE_AT_EXIT),
1567 };
1568
1569 static struct sm501_platdata_fb sm501_fb_pdata = {
1570 .fb_route = SM501_FB_OWN,
1571 .fb_crt = &sm501_pdata_fbsub,
1572 .fb_pnl = &sm501_pdata_fbsub,
1573 };
1574
1575 static struct sm501_platdata sm501_pci_platdata = {
1576 .init = &sm501_pci_initdata,
1577 .fb = &sm501_fb_pdata,
1578 .gpio_base = -1,
1579 };
1580
1581 static int sm501_pci_probe(struct pci_dev *dev,
1582 const struct pci_device_id *id)
1583 {
1584 struct sm501_devdata *sm;
1585 int err;
1586
1587 sm = kzalloc(sizeof(struct sm501_devdata), GFP_KERNEL);
1588 if (sm == NULL) {
1589 dev_err(&dev->dev, "no memory for device data\n");
1590 err = -ENOMEM;
1591 goto err1;
1592 }
1593
1594 /* set a default set of platform data */
1595 dev->dev.platform_data = sm->platdata = &sm501_pci_platdata;
1596
1597 /* set a hopefully unique id for our child platform devices */
1598 sm->pdev_id = 32 + dev->devfn;
1599
1600 pci_set_drvdata(dev, sm);
1601
1602 err = pci_enable_device(dev);
1603 if (err) {
1604 dev_err(&dev->dev, "cannot enable device\n");
1605 goto err2;
1606 }
1607
1608 sm->dev = &dev->dev;
1609 sm->irq = dev->irq;
1610
1611 #ifdef __BIG_ENDIAN
1612 /* if the system is big-endian, we most probably have a
1613 * translation in the IO layer making the PCI bus little endian
1614 * so make the framebuffer swapped pixels */
1615
1616 sm501_fb_pdata.flags |= SM501_FBPD_SWAP_FB_ENDIAN;
1617 #endif
1618
1619 /* check our resources */
1620
1621 if (!(pci_resource_flags(dev, 0) & IORESOURCE_MEM)) {
1622 dev_err(&dev->dev, "region #0 is not memory?\n");
1623 err = -EINVAL;
1624 goto err3;
1625 }
1626
1627 if (!(pci_resource_flags(dev, 1) & IORESOURCE_MEM)) {
1628 dev_err(&dev->dev, "region #1 is not memory?\n");
1629 err = -EINVAL;
1630 goto err3;
1631 }
1632
1633 /* make our resources ready for sharing */
1634
1635 sm->io_res = &dev->resource[1];
1636 sm->mem_res = &dev->resource[0];
1637
1638 sm->regs_claim = request_mem_region(sm->io_res->start,
1639 0x100, "sm501");
1640 if (sm->regs_claim == NULL) {
1641 dev_err(&dev->dev, "cannot claim registers\n");
1642 err= -EBUSY;
1643 goto err3;
1644 }
1645
1646 sm->regs = pci_ioremap_bar(dev, 1);
1647
1648 if (sm->regs == NULL) {
1649 dev_err(&dev->dev, "cannot remap registers\n");
1650 err = -EIO;
1651 goto err4;
1652 }
1653
1654 sm501_init_dev(sm);
1655 return 0;
1656
1657 err4:
1658 release_resource(sm->regs_claim);
1659 kfree(sm->regs_claim);
1660 err3:
1661 pci_disable_device(dev);
1662 err2:
1663 kfree(sm);
1664 err1:
1665 return err;
1666 }
1667
1668 static void sm501_remove_sub(struct sm501_devdata *sm,
1669 struct sm501_device *smdev)
1670 {
1671 list_del(&smdev->list);
1672 platform_device_unregister(&smdev->pdev);
1673 }
1674
1675 static void sm501_dev_remove(struct sm501_devdata *sm)
1676 {
1677 struct sm501_device *smdev, *tmp;
1678
1679 list_for_each_entry_safe(smdev, tmp, &sm->devices, list)
1680 sm501_remove_sub(sm, smdev);
1681
1682 device_remove_file(sm->dev, &dev_attr_dbg_regs);
1683
1684 sm501_gpio_remove(sm);
1685 }
1686
1687 static void sm501_pci_remove(struct pci_dev *dev)
1688 {
1689 struct sm501_devdata *sm = pci_get_drvdata(dev);
1690
1691 sm501_dev_remove(sm);
1692 iounmap(sm->regs);
1693
1694 release_resource(sm->regs_claim);
1695 kfree(sm->regs_claim);
1696
1697 pci_disable_device(dev);
1698 }
1699
1700 static int sm501_plat_remove(struct platform_device *dev)
1701 {
1702 struct sm501_devdata *sm = platform_get_drvdata(dev);
1703
1704 sm501_dev_remove(sm);
1705 iounmap(sm->regs);
1706
1707 release_resource(sm->regs_claim);
1708 kfree(sm->regs_claim);
1709
1710 return 0;
1711 }
1712
1713 static const struct pci_device_id sm501_pci_tbl[] = {
1714 { 0x126f, 0x0501, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
1715 { 0, },
1716 };
1717
1718 MODULE_DEVICE_TABLE(pci, sm501_pci_tbl);
1719
1720 static struct pci_driver sm501_pci_driver = {
1721 .name = "sm501",
1722 .id_table = sm501_pci_tbl,
1723 .probe = sm501_pci_probe,
1724 .remove = sm501_pci_remove,
1725 };
1726
1727 MODULE_ALIAS("platform:sm501");
1728
1729 static const struct of_device_id of_sm501_match_tbl[] = {
1730 { .compatible = "smi,sm501", },
1731 { /* end */ }
1732 };
1733
1734 static struct platform_driver sm501_plat_driver = {
1735 .driver = {
1736 .name = "sm501",
1737 .owner = THIS_MODULE,
1738 .of_match_table = of_sm501_match_tbl,
1739 },
1740 .probe = sm501_plat_probe,
1741 .remove = sm501_plat_remove,
1742 .suspend = sm501_plat_suspend,
1743 .resume = sm501_plat_resume,
1744 };
1745
1746 static int __init sm501_base_init(void)
1747 {
1748 platform_driver_register(&sm501_plat_driver);
1749 return pci_register_driver(&sm501_pci_driver);
1750 }
1751
1752 static void __exit sm501_base_exit(void)
1753 {
1754 platform_driver_unregister(&sm501_plat_driver);
1755 pci_unregister_driver(&sm501_pci_driver);
1756 }
1757
1758 module_init(sm501_base_init);
1759 module_exit(sm501_base_exit);
1760
1761 MODULE_DESCRIPTION("SM501 Core Driver");
1762 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>, Vincent Sanders");
1763 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support